For decades, the has been the gold standard for high-volume shotgun shell reloading. Whether you are a competitive trap shooter burning through flats of 12-gauge shells or a waterfowl hunter looking to fine-tune your 20-gauge loads, the 366 is a mechanical marvel. However, like any progressive press with over 100 moving parts, things wear out, springs break, and adjustments drift.

So Arthur did what he always did when a machine lied to him. He reached for the diagram.

For specific part numbers not listed in the standard manual, you can contact at 1-800-338-3220 .

Arthur’s eyes drifted to the upper tier: the Powder Slide Assembly (#85–92). The diagram showed the brass powder bushings nested like Russian dolls, the metering insert (#88) drawn with an almost anatomical precision. He remembered buying the machine used, finding an old #88 clogged with Unique powder that had turned to lacquer. The previous owner had never cleaned it. Had never looked at this diagram.

When that happens, a search for becomes the most critical internet search you will perform. A parts diagram is not just a pretty picture; it is the Rosetta Stone for diagnosing jams, identifying a mysterious missing spring, and ordering the correct replacement part.